scholarly journals An Improved FFIP Method Based on Mathematical Logic and SysML

2021 ◽  
Vol 11 (8) ◽  
pp. 3534
Author(s):  
Jian Jiao ◽  
Shujie Pang ◽  
Jiayun Chu ◽  
Yongfeng Jing ◽  
Tingdi Zhao
Keyword(s):  
Mathematical Logic ◽  
Failure Process ◽  
Modeling Language ◽  
Fault Propagation ◽  
Functional Failure ◽  
Cut Set ◽  
Simulation Results ◽  
Propagation Paths ◽  
Graphics Processing ◽  
State Machine Diagram

In recent years, the model-based safety analysis (MBSA) has been developing continuously. The Functional Failure Identification and Propagation (FFIP) method is a graphics processing technology which supports the analysis of fault propagation paths before making costly design commitments. However, the traditional FFIP has some deficiencies. In this paper, we extend the functional failure logic (FFL) in the FFIP and introduce the concept of deviation. So, FFIP can be used to analyze the failure process of the systems and make the logical analysis of functional failure easier. Based on the extended FFL, we present a new overview of the FFIP. The FFIP is improved by using mathematical logic and Systems Modeling Language (SysML). The standard expression of FFL is realized, which is conducive to the subsequent modeling and modification. Additionally, we use the failure logic analysis in the FFIP to improve the state machine diagram (SMD) in SysML. Finally, the improved FFIP method is used to analyze the fault propagation paths of the system and Simulink is used for simulation. The fault tree is generated according to the simulation results, the minimum cut set is calculated, and the key failure parts of the system are obtained.

Environmental Modeling and Walking Simulation of Quadruped Search-Rescue Robot Based on VRML

2014 ◽  
Vol 494-495 ◽  
pp. 1270-1273
Author(s):  
Peng Wang ◽  
Ji Xiang Li ◽  
Yuan Zhang ◽  
Wen Hao Jiang
Keyword(s):  
Simulation Model ◽  
Environmental Modeling ◽  
Modeling Language ◽  
Displacement Curve ◽  
Rescue Robot ◽  
Modeling Technology ◽  
Real Environment ◽  
Simulation Results

In order to create the virtual earthquake environment, VRML modeling language is used to build a real environment that is a 3D mountain scene after earthquake. A simulation model of quadruped search-rescue robot is established in VRML modeling technology. The walking stability of quadruped search-rescue robot is observed using the VRML model established with the change of gravity curve. Simulation results show that the gravity displacement curve of the robot is smooth.

Numerical Simulation on AE Characteristics of Rock and Concrete Materials

2007 ◽  
Vol 353-358 ◽  
pp. 961-964 ◽  
Author(s):  
Yu Mei Kang ◽  
Chun An Tang ◽  
Zheng Zhao Liang ◽  
Gen Gye Chen
Keyword(s):  
Crack Propagation ◽  
Failure Process ◽  
Great Influence ◽  
Space Distribution ◽  
Bending Test ◽  
Propagation Path ◽  
Notch Depth ◽  
Crack Propagation Path ◽  
Three Point Bending ◽  
Simulation Results

Based on physical model of three-point-bending test, the AE characteristics of three-point-bending beams with different relative notch depth during the entire loading period was simulated by using RFPA3D(realistic failure process analysis) code. Simulation results show that the relative notch depth affects the AE characteristics significantly. With increasing relative notch depth, the occurrence of AE events decreases remarkably. The stress distribution figures, elastic modulus photo and AE relative energy time-space distribution figures as well as an analysis on the failure process are also provided. Based on the analysis of simulation results, it is concluded that the heterogeneity of rock and concrete has great influence on the crack propagation path, which leads the crack propagation path becoming curvilinear.

A Graph-Based Framework for Early Assessment of Functional Failures in Complex Systems

2007 ◽  
Author(s):  
Tolga Kurtoglu ◽  
Irem Y. Tumer
Keyword(s):  
Design Process ◽  
Qualitative Reasoning ◽  
Critical Event ◽  
Fault Propagation ◽  
Early Assessment ◽  
Functional Failure ◽  
Physical Systems ◽  
Failure Risk ◽  
Behavioral Simulation ◽  
Novel Approach

In this paper, the Functional Failure Identification and Propagation (FFIP) framework is introduced as a novel approach for evaluating and assessing functional failure risk of physical systems during conceptual design. The task of FFIP is to estimate potential faults and their propagation paths under critical event scenarios. The framework is based on combining hierarchical system models of functionality and configuration, with behavioral simulation and qualitative reasoning. The main advantage of the method is that it allows the analysis of functional failures and fault propagation at a highly abstract system concept level before any potentially high-cost design commitments are made. As a result, it provides the designers and system engineers with a means of designing out functional failures where possible and designing in the capability to detect and mitigate failures early on in the design process. Application of the presented method to a fluidic system example demonstrates these capabilities.

Finite Element Simulation and Comparison of Hydraulic Splitting Fracturing Test of Concrete

2014 ◽  
Vol 678 ◽  
pp. 551-555
Author(s):  
Xue Zhi Wang ◽  
Hao Fei Zou ◽  
Shu Wen Zheng ◽  
Yuan Li ◽  
Jun Yu Liu
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Mixed Mode ◽  
Failure Process ◽  
Crack Tip ◽  
Mixed Mode Fracture ◽  
Test Results ◽  
Mode Fracture ◽  
Element Simulation ◽  
Simulation Results

I-II mixed mode fracture under two kinds of load manners was carried out, and it was also simulated by the ANSYS, and the test results and the simulation results were compared and analyzed, and the reasonableness of the model built and the effectiveness of test were verified. The failure process of fracture under the loading could be judged through the development of the crack tip combined with the stress nephogram and strain nephogram when cracks initiation at crack tip, and it provided the basis for the crack damage judgment.

scholarly journals MadFlow: automating Monte Carlo simulation on GPU for particle physics processes

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Stefano Carrazza ◽  
Juan Cruz-Martinez ◽  
Marco Rossi ◽  
Marco Zaro
Keyword(s):  
Monte Carlo ◽  
Particle Physics ◽  
Graphics Processing Units ◽  
Hardware Acceleration ◽  
Leading Order ◽  
Event Simulation ◽  
Multiple Processes ◽  
Analytic Expressions ◽  
Simulation Results ◽  
Graphics Processing

AbstractWe present , a first general multi-purpose framework for Monte Carlo (MC) event simulation of particle physics processes designed to take full advantage of hardware accelerators, in particular, graphics processing units (GPUs). The automation process of generating all the required components for MC simulation of a generic physics process and its deployment on hardware accelerator is still a big challenge nowadays. In order to solve this challenge, we design a workflow and code library which provides to the user the possibility to simulate custom processes through the MadGraph5_aMC@NLO framework and a plugin for the generation and exporting of specialized code in a GPU-like format. The exported code includes analytic expressions for matrix elements and phase space. The simulation is performed using the VegasFlow and PDFFlow libraries which deploy automatically the full simulation on systems with different hardware acceleration capabilities, such as multi-threading CPU, single-GPU and multi-GPU setups. The package also provides an asynchronous unweighted events procedure to store simulation results. Crucially, although only Leading Order is automatized, the library provides all ingredients necessary to build full complex Monte Carlo simulators in a modern, extensible and maintainable way. We show simulation results at leading-order for multiple processes on different hardware configurations.

scholarly journals Specifying the Directionality of Fault Propagation Paths Using Transfer Entropy

2004 ◽  
Vol 37 (9) ◽  
pp. 203-208 ◽  
Author(s):  
Margret Bauer ◽  
Nina F. Thornhill ◽  
Adrian Meaburn
Keyword(s):  
Transfer Entropy ◽  
Fault Propagation ◽  
Propagation Paths

scholarly journals Numerical Investigation of Fracture Network Formation under Multiple Wells

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Xiaoxi Men ◽  
Jiren Li
Keyword(s):  
Pore Pressure ◽  
Hydraulic Fracture ◽  
Network Formation ◽  
Process Analysis ◽  
Flow Direction ◽  
Failure Process ◽  
Fracture Network ◽  
Hydraulic Fractures ◽  
Fracture Evolution ◽  
Simulation Results

A two-step fracturing method is proposed to investigate the hydraulic fracture evolution behavior and the process of complex fracture network formation under multiple wells. Simulations are conducted with Rock Failure Process Analysis code. Heterogeneity and permeability of the rocks are considered in this study. In Step 1, the influence of an asymmetric pressure gradient on the fracture evolution is simulated, and an artificial structural plane is formed. The simulation results reflect the macroscopic fracture evolution induced by mesoscopic failure; these results agree well with the characteristics of the experiments. Step 2, which is based on the first step, investigates the influence of preexisting fractures (i.e., artificial structural planes) on the subsequent fracturing behavior. The simulation results are supported by mechanics analysis. Results indicated that the fracture evolution is influenced by pressure magnitude on a local scale around the fracture tip and by the orientation and distribution of pore pressure on a global scale. The constant pressure in wellbore H2 can affect fracture propagation by changing the water flow direction, and the hydraulic fractures will propagate to the direction of higher local pore pressure. Furthermore, the artificial structural planes influence the stress distribution surrounding the wellbores and the hydraulic fracture evolution by altering the induced stresses around the preexisting fractures. Finally, fracture network is formed among the artificial structural planes and hydraulic fractures when multiple wells are fractured successively. This study provides valuable guidance to unconventional reservoir reconstruction designs.

scholarly journals Architecture exploration of recent GPUs to analyze the efficiency of hardware resources

2021 ◽  
Vol 10 (2) ◽  
pp. 917-926
Author(s):  
Viet Tan Vo ◽  
Cheol Hong Kim
Keyword(s):  
Performance Improvement ◽  
Graphics Processing Units ◽  
Future Generation ◽  
Architecture Exploration ◽  
Development Direction ◽  
Simulation Results ◽  
Memory Resources ◽  
Graphics Processing ◽  
Performance Gains ◽  
Gpu Architecture

This study analyzes the efficiency of parallel computational applications with the adoption of recent graphics processing units (GPUs). We investigate the impacts of the additional resources of recent architecture on the popular benchmarks compared with previous architecture. Our simulation results demonstrate that Pascal GPU architecture improves the performance by 273% on average compared to old-fashioned Fermi architecture. To evaluate the performance improvement depending on specific hardware resources, we divide the hardware resources into two types: computing and memory resources. Computing resources have bigger impact on performance improvement than memory resources in most of benchmarks. For Hotspot and B+ tree, the architecture adopting only enhanced computing resources can achieve similar performance gains of the architecture adopting both computing and memory resources. We also evaluate the influence of the number of warp schedulers in the SM (Streaming Multiprocessor) to the GPU performance in relationship with barrier waiting time. Based on these analyses, we propose the development direction for the future generation of GPUs.

scholarly journals A Meso Level FE Model for the Impact Bullet - Yarn

2019 ◽  
Vol 56 (1) ◽  
pp. 22-31
Author(s):  
Catalin Pirvu ◽  
Andrea Elena Musteata ◽  
George Ghiocel Ojoc ◽  
Simona Sandu ◽  
Lorena Deleanu
Keyword(s):  
Thermal Effect ◽  
Failure Process ◽  
The Other ◽  
Fe Model ◽  
Elastic Recoil ◽  
Aramid Fibers ◽  
Fiber Failure ◽  
Lead Alloys ◽  
Simulation Results ◽  
The Impact

This paper presents a study based on simulating the impact between a yarn (or a single fiber with greater dimensions) and a bullet, the impact velocity being 400 m/s. The characteristics of the involved materials are taken from literature. The yarn is considered isotrope, but the values of the characteristics are close to those of aramid fibers and cooper and lead alloys used for manufacturing the bullets. Analysing the yarn failure caused by a bullet, this FE model allows for identfying the stages in the failure process. First, the yarn is pushed by the bullet and the local elongation of the yarn is tacking place. The yarn rupture occurs in the �strangled� zones, caused by the stretch of the yarn directly supporting the impact. The breaking of the yarn in the thinned zone (more pronounced asymmetric breaking) and it is visible that the yarn elastic recoil starts next the bullet. The friction between the yarn and the bullet is only on the conical surface of the bullet in the tapered zone of the bullet. The yarn is detaching from the bullet (the contact zones between the bullet and the yarn in polymeric matrix become smaller, justifying a neglectable influence of the thermal effect). The yarn has no more contact with the bullet. This step is in the favor of the assumption that, in the actual multi-yarn impact, the other layers of yarns maintain the bullet and the first yarns in contact and this is why bunch of fibers (fragments of the failed yarns) are pressed against the bullet and remain on it. The simulation results were qualitatively validated by SEM investigations of fiber failure under the same conditions as the model.

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